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You ______ wash your hands before meals. It is good for your health.
A. may  B. can  C. must
C

试题分析:A. may表推测,可能 B. can 能够    C. must必须,肯定推测,根据句意:你必须饭前洗手,这对你的健康又好处,be good for对……有好处;故选C.
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